Classifications

• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/02—Aerobic processes
  • C02F3/12—Activated sludge processes
  • C02F3/1205—Particular type of activated sludge processes
  • C02F3/1226—Particular type of activated sludge processes comprising an absorbent material suspended in the mixed liquor
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/28—Anaerobic digestion processes
  • C02F3/2806—Anaerobic processes using solid supports for microorganisms
• • C—CHEMISTRY; METALLURGY
  • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
  • C02F3/00—Biological treatment of water, waste water, or sewage
  • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W10/00—Technologies for wastewater treatment
  • Y02W10/10—Biological treatment of water, waste water, or sewage
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S210/00—Liquid purification or separation
  • Y10S210/902—Materials removed
  • Y10S210/903—Nitrogenous
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S210/00—Liquid purification or separation
  • Y10S210/902—Materials removed
  • Y10S210/906—Phosphorus containing

Definitions

• a process is disclosed for purification of sewage by biological means.
• a significant problem connected with sewage disposal is that the sewage contains dissolved phosphorus and nitrogen which is difficult to separate from the fouled water.
• cellulose provides a source of the carbon which is essential to the growth of cellulolytic micro-organisms; the absorption of nitrogen and phosphorus is a feature of the growth of such micro-organisms.
• the main object of the process disclosed is that of bringing about a drastic reduction in the phosphorus and nitrogen content of sewage.
• the process also has the advantages of being highly economical and of providing by-products in the form of phosphorus- and nitrogen-rich fertilizer.
• the process disclosed which may be integrated into all the aerobic processes embraced by the prior art and mentioned thus far, exploits the natural existence in sewage of cellulose-devouring micro-organisms by introducing cellulosic matter in the raw state, added at any stage of the overall process in particles of any size whatever, with the end in view of bringing about contact in aerobic conditions, prolonged to a given degree, between the fouled water and the cellulosic matter.
• heterotrophic micro-organisms can be augmented to advantage by recycling a proportion of the muds settled in the third stage, in similar fashion to the conventional practice whereby augmentation of other bacteria is generally induced.
• Materials which lend themselves particularly well to the process would be straw, wood-shavings, sawdust, waste paper, etc.; these may be employed in their raw state, requiring no preliminary treatment beyond that of shredding, grinding or similar.
• Cellulosic matter possesses a markedly low nitrogen-and-phosphorus content (quantifiable as 1% nitrogen and 0.1% phosphorus), and its introduction into the sewage triggers heterotrophic decomposition, brought about by the cellulose-devouring micro-organisms, which is accompanied by absorption of the nitrogen and phosphorus dissolved in the fouled water.
• nitrogen-and phoshporus-rich aggregates that in separating from the water, purify it of the two elements in question, and are precipitated during the clarification and settling stages in the form of muds. A proportion of such muds is recycled to assist the purification process whilst the remainder is drawn off for utilization ultimately, following suitable treatment, in the manufacture of fertilizer or other by-products.
• the muds obtained with a process as disclosed are natural fertilizing agents, rich in nitrogen and phosphorus, and notwithstanding the as yet incomplete nature of experimental data regarding such muds, their employment in agriculture should nevertheless give more positive results than those produced by the muds currently precipitated.
• the overall quantity of nitrogen and phosphorus assimilated by the aggregates produced as a result of the aforedescribed decomposition of cellulosic matter will depend both on the quantity of matter introduced and on the duration of the process; clearly, the greater the quantity of cellulosic matter, and the longer the duration of the process, the greater will be the quantity of elements freed from the fouled water and assimilated during the process.
• cellulosic matter in special plant where nitrogen is eliminated partly by denitrification, the use of cellulosic matter as aforedescribed can replace currently-used sources of carbon (costly media such as methanol and ethanol) to significant advantage, and might be integrated into the aforementioned process as a preliminary step.
• cellulosic materials of the type in question might be used in systems of any given type; likewise, provision might be made in existing installations for a specific stage in which to carry out cellulosic treatment of the type described.

Landscapes

• Life Sciences & Earth Sciences (AREA)
• Microbiology (AREA)
• Organic Chemistry (AREA)
• Hydrology & Water Resources (AREA)
• Engineering & Computer Science (AREA)
• Environmental & Geological Engineering (AREA)
• Water Supply & Treatment (AREA)
• Chemical & Material Sciences (AREA)
• Biodiversity & Conservation Biology (AREA)
• Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
• Biological Treatment Of Waste Water (AREA)
• Fertilizers (AREA)
• Water Treatment By Sorption (AREA)
• Micro-Organisms Or Cultivation Processes Thereof (AREA)
• Separation Of Suspended Particles By Flocculating Agents (AREA)
• Preparation Of Compounds By Using Micro-Organisms (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=11246435

Family Applications (1)

Country Status (9)

Cited By (14)

Citations (9)

Family Cites Families (3)

• 1985
  • 1985-01-25 IT IT4000885A patent/IT1229065B/it active
• 1986
  • 1986-01-23 CA CA 500204 patent/CA1276323C/fr not_active Expired - Lifetime
  • 1986-01-24 IE IE860202A patent/IE860202L/xx unknown
  • 1986-01-24 FI FI864205A patent/FI864205L/fi not_active Application Discontinuation
  • 1986-01-24 EP EP86900835A patent/EP0210218A1/fr not_active Withdrawn
  • 1986-01-24 WO PCT/IT1986/000006 patent/WO1986004322A1/fr not_active Ceased
  • 1986-01-24 US US06/912,248 patent/US4721585A/en not_active Expired - Fee Related
  • 1986-01-24 JP JP61500853A patent/JPS63500705A/ja active Granted
  • 1986-09-08 DK DK428586A patent/DK428586A/da not_active Application Discontinuation

Patent Citations (9)

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